Part of me's thinking your letter really knocked him on his heels. I think he's feeling some of that anxiety you're also feeling. I'm hoping he sticks with his IC and ultimately you two will be able to get a good MC and stick with it. Unfortunately, you're probably going to have that anxiety for some time.
I can see how it's hard to shift gears when you've been walking on eggshells for so long.
Keep working on your GAL. I have found it's the best thing to relieve the anxiety. GAL to the point where you feel like you're finding yourself.